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US 6,555,952 B1Granted
Electron gun and cathode ray tube using the same
AssigneeSamsung SDI Co., Ltd.
InventorsDuk-sung Park, Sang-kyun Kim, Bong-wook Jung, Chul-sik Cho
Life of this patent
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Abstract
A final focus electrode includes a cylindrical base on one end and a conical portion on the other end such that the diameter of the conical portion is greater than that of the base and also gradually increases with distance from the base. The conical portion of the final focus electrode is located inside a cylindrical accelerating electrode such that it is coaxially surrounded by the latter.
Claims5
A cathode ray tube comprising an electron gun assembly having
- a central axis,
- a control electrode having a thickness and an electron beam-passing aperture with a diameter, the thickness being larger than 10% of the diameter of the electron beam-passing aperture,
- a focusing electrode coaxial with the central axis, and
- an accelerating electrode coaxial with the central axis, the focusing electrode comprising an elongated cylindrical base portion and a conical portion having a side wall and joined to the cylindrical base portion, the accelerating electrode axially surrounding the conical portion of the focusing electrode, wherein the side wall of the conical portion is tapered from the cylindrical base portion to a free end of the focusing electrode.
1 more element
A cathode ray tube comprising an electron gun assembly having
- a central axis,
- a control electrode having a thickness and an electron beam-passing aperture with a diameter,
- an accelerating electrode coaxial with the central axis, and
- a focusing electrode coaxial with the central axis and partially inside and spaced from the accelerating electrode, the focusing electrode comprising a tubular portion consisting of an elongated cylindrical base portion and a conical portion joined to the cylindrical base portion, the accelerating electrode axially surrounding the conical portion of the focusing electrode.
1 more element
Dependencies are inferred from the claim text.